8th Class Science Sample Paper Science Sample Paper-3

  • question_answer 29) The bulb glows when the electric current passes through it. Explain why?                                           

    Answer:

    Due to the heating effect of current, the filament of the bulb gets heated to high temperature and it starts glowing. However, if the current through a circuit is weak, the filament does not get heated sufficiently and even does not glow.


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